CN103276344B - Deep layer QPQ salt bath complex intensifying modification new and high technology - Google Patents
Deep layer QPQ salt bath complex intensifying modification new and high technology Download PDFInfo
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- CN103276344B CN103276344B CN201210579858.9A CN201210579858A CN103276344B CN 103276344 B CN103276344 B CN 103276344B CN 201210579858 A CN201210579858 A CN 201210579858A CN 103276344 B CN103276344 B CN 103276344B
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Abstract
Deep layer QPQ salt bath complex intensifying modification new and high technology of the present invention, it relates to a kind of brand-new metal salt bath compound surface strengthening modification technology, and its treatment process is: clean-out system degreasing → clear water rinsing → preheating → nitrogenize → oxidation → cold wash is desalted → drying → immersion oil.The present invention has deep layer and urges and ooze effect, forms the high quality infiltration layer with enough degree of depth and certain degree of hardness at workpiece surface, and its performance of improvement that can be larger.
Description
Technical field:
Deep layer QPQ salt bath complex intensifying modification new and high technology of the present invention, it relates to a kind of brand-new metal salt bath compound surface strengthening modification technology, and its treatment process is: clean-out system degreasing → clear water rinsing → preheating → nitrogenize → oxidation → cold wash is desalted → drying → immersion oil.The present invention has deep layer and urges and ooze effect, forms the high quality infiltration layer with enough degree of depth and certain degree of hardness at workpiece surface, and its performance of improvement that can be larger.
background technology:
Deep layer QPQ technology is on the basis retaining original common Q PQ technology, deepens the compound degree of depth of nitrogenize operation, makes it to be deepened to more than 30um by original 15-20um.Deep layer QPQ technology comprises the salt bath of the compound layer degree of depth at more than 30um or the nitriding of gas, or the oxidation operation of carbonitriding and salt bath subsequently or gas, and middle also have polishing process.To process metal by this technique and do not need to spray any protective material, and technique is simple, with low cost, energy-conserving and environment-protective are nuisanceless, and Working environment cleans, the features such as appearance looks elegant.This technology has accomplished that starting material are nontoxic free from environmental pollution, and every environmental protection index measures through environmental administration and is all up to state standards, and makes the wear resistance of metallic surface, erosion resistance and mechanical property hardness strength have raising by a larger margin simultaneously.
Existing common Q PQ technology has significant limitation in application aspect, and its reason is exactly that the compound layer degree of depth is too shallow, can not bear heavy loading, can not bear high speed load, can not bear larger wearing and tearing.If the compound layer degree of depth is increased exponentially, the wear resistance of infiltration layer also can be improved accordingly.Deep layer QPQ technology may be used for than the larger load of common Q PQ technology, more speed, part that abrasion loss is larger.The part of common Q PQ process can not bear grinding, but the part of deep layer QPQ process can bear grinding, and therefore deep layer QPQ more may be used for high precision precision component.
Though existing common Q PQ solidity to corrosion is fine, but if the intensification at double of the compound layer degree of depth, solidity to corrosion also can be improved accordingly, because corrosion proof raising is completely according to resistance to compound layer in QPQ technology.
Deepen the compound layer degree of depth and mainly nitriding temperature is brought up to more than 600 DEG C by 520 DEG C ~ 580 DEG C now.But it is a brand-new problem in Metallkunde field that nitriding temperature brings up to more than 600 DEG C, the temperature in usual iron and steel nitriding region is 500 DEG C ~ 600 DEG C, the temperature in carbonitriding region is more than 750 DEG C, and for a long time, 600 DEG C ~ 750 DEG C is the technological gap district of steel material surface process.Deep layer QPQ technology has filled up this technological gap district domestic first.
Much all require high solidity to corrosion with relevant product abroad at present, common Q PQ technology has been difficult to meet the demands.Such as the solidity to corrosion of a lot of concern-foreigner-product neutral salt spray test requires to reach more than 300h now, and this is that common Q PQ technology is beyond one's reach, and adopts deep layer QPQ technology can reach this index completely.
Deep layer QPQ technology has application prospect widely, and being first had a lot of product to want to adopt QPQ technology originally, but can not adopt because its infiltration layer is too thin, and present deep layer QPQ technology can broadened application scale in this respect; Next is the product of existing employing common Q PQ technology, if adopt deep layer QPQ technology can increase substantially the wear resistance of product, solidity to corrosion and fatigue strength, extends the work-ing life of product, therefore You compare great market in improving the quality of products.The compound layer of more than 30um can bear some accurate grinding, such deep layer QPQ technology can expand have widely in the application aspect of a lot of high-precision product, very important purposes.In a word, the potential market of deep layer QPQ technology is very huge.
summary of the invention:
The object of this invention is to provide the metal salt bath compound surface strengthening modification technology that deep layer QPQ is brand-new, it has deep layer and urges and ooze effect, the high quality deep layer with enough degree of depth and certain degree of hardness is formed at workpiece surface, and can greatly improve its performance, meet the technical requirements of metal salt-bath nitriding, improve the surface property of nitrogenize workpiece further, thus reduce energy consumption, raise the efficiency and benefit, the hardness of metallic surface can be improved, intensity, impact property, wear resistance and erosion resistance, each side in work-ing life extending product all has significant effect, is widely applied to automobile, motorcycle, textile manufacturing machine, light industry machinery, engineering machinery, agricultural machine, food machinery, plastics machinery, petroleum machinery, instrument, boats and ships, radar, firearms, lathe, gear, instrument, mould, five metals, light industry, pipelines and petrochemical pipelines, photographic camera, sewing machine, washing machine, shoes making machine, hydraulic part, in the industries such as sheet metal component, can production efficiency be increased substantially, improve the quality of products, simplification of flowsheet, shorten the production cycle, reduce production cost, increase social benefit.
In order to solve the problem existing for background technology, by the following technical solutions, its treatment process is in the present invention: clean-out system degreasing → clear water rinsing → preheating → nitrogenize → oxidation → cold wash is desalted → drying → immersion oil.
Deep layer QPQ salt bath complex intensifying modification new and high technology of the present invention, embodiment:
embodiment:
Described clean-out system degreasing is treating that the workpiece of nitrogenize is placed in the container containing metal 7# clean-out system, then will treat greasy dirt and the account thing scrub of the workpiece surface of nitrogenize with cotton yarn piece by piece, finally removes clean by the cotton yarn being bonded at workpiece surface.Effect: clean-out system has stronger degreasing and soil removability, and is easy to rinse, is not easy to remain on the surface of the workpiece.
Described clear water rinsing to treat that the workpiece of nitrogenize is placed in rinse bath, then use clear water rinsing 2 times.Effect: in clean-out system after cleaning, must thorough rinsing in clear water, in case workpiece surface remains clean-out system.
Described preheating crucible is put into air furnace carry out preheating, and preheating temperature is 300 DEG C ~ 400 DEG C, and warm up time is 20 ~ 30min., in order to avoid there is sputtering phenomenon when band water conservancy project part directly enters nitrogenize salt bath in effect: 1) dry the moisture that workpiece surface brings out from rinse bath; 2) salt temperature is made to decline when preventing cold workpiece from directly hanging in nitriding furnace too many.After generally entering nitriding furnace with workpiece, furnace temperature decline is no more than 40 DEG C as well, and returns to appointment furnace temperature within 20min minute; 3) outward appearance after workpiece can be made treated, evenly consistent, does not produce surface imperfection.
Described nitrogenize first hangs in electric furnace by the crucible through cleaning, rust cleaning, and then inserted in crucible near sidewall of crucible by temperature control galvanic couple, temperature control instrument fixes on 700 DEG C, then starts intensificationization salt.Again base salt is added in crucible, be added to 3/4 of the crucible degree of depth.Then bell is covered, start ventilation system, treat that the salt of crucible bottom starts to melt and after sinking, continue to add appropriate base salt, base salt bath face is made to remain at substantially identical height, to the last all be fused into liquid, when salt bath face rises to distance crucible top edge 150mm, stop salt adding.When cyanate radical is lower than required value 32%, adjustment salt 4kg should be added in nitrogenize salt bath, to improve cyanate radical content to 35%.After base salt all melts, run 4h at 600 ~ 650 DEG C of air furnaces, then come into operation.Nitriding temperature is 600 DEG C ~ 700 DEG C, and nitridation time is 180 ~ 240min.Effect: 1) form the compound layer of the densification of enough degree of depth and the diffusion layer of respective depth at workpiece surface.Increase substantially metallic surface wear resistance, solidity to corrosion and fatigue performance; 2) base salt is for filling up the nitriding furnace crucible of initial period sky of going into operation, and supplements after normal production as salt bath consumption, is used for raising salt bath face; 3) adjusting salt is when in salt bath, cyanate radical declines, and adds in nitriding furnace the content being used for raising cyanate radical.
Described oxidation first hangs in electric furnace by clean rustless crucible, and instrument constant temperature is at 220 DEG C, and thermopair is near sidewall of crucible.Then add in crucible by saline oxide, be added to 1/2 of crucible height, be then energized fusing.Add saline oxide gradually again after the salt that first time adds all melts, add suitable number at every turn, limit is melted, while add, until liquid level is elevated to distance crucible top edge 200mm.After salt bath face meets the requirements of height, be incubated 220 DEG C, moisture is volatilized in a large number, until liquid level no longer includes bubble produce complete calmness.Then salt temperature heats up 10 ~ 20 DEG C again ..., so circulate, until temperature is raised to 370 DEG C.Oxidizing temperature is 350 DEG C ~ 370 DEG C, and oxidization time is 15 ~ 20min.Effect: 1) workpiece is thoroughly decomposed from the cyanogen root the nitridation salt that nitriding furnace brings out, eliminates public hazards; 2) form the oxide film of black at workpiece surface, increase the antirust ability of workpiece, and beautify the effect of workpiece outward appearance in addition; 3) compound layer can be made to be oxidized, increase the oxygen level in compound layer, make its passivation, increase substantially solidity to corrosion.
Described cold wash is desalted be workpiece from oxidized still out after precooling in atmosphere, until the saline solution of workpiece surface all starts condensation, then workpiece sent in cold water clean.Effect: the temperature of workpiece is declined gradually and saline oxide workpiece surface in cold water dissolves.
Described drying is that workpiece puts into hot water tank again, insulation after cold water cleaning, then cools in atmosphere, and workpiece is dry rapidly.Effect: ensure that workpiece is dry, and accelerate workpiece rate of drying, shortens the production cycle.Sticky floating saccharoid on the dry rear surface of workpiece is avoided to affect workpiece visual appearance.
Described immersion oil is after workpiece drying, puts into total loss system oil and soaks 2 ~ 3min, then done by oil droplet.Effect: after workpiece immersion oil, appearance luster is uniformity more.Workpiece is after immersion oil, and the surface of workpiece is covered to close by oil reservoir and becomes finer and close and have certain antirust ability.
Claims (8)
1. a deep layer QPQ new and high technology, is characterized in that its treatment process is: clean-out system degreasing → clear water rinsing → preheating → nitrogenize → oxidation → cold wash is desalted → drying → immersion oil;
Described nitrogenize first hangs in electric furnace by the crucible through cleaning, rust cleaning, and then inserted in crucible near sidewall of crucible by temperature control galvanic couple, temperature control instrument fixes on 700 DEG C, then starts intensificationization salt; Again base salt is added in crucible, be added to 3/4 of the crucible degree of depth; Then bell is covered, start ventilation system, treat that the salt of crucible bottom starts to melt and after sinking, continue to add appropriate base salt, base salt bath face is made to remain at substantially identical height, to the last all be fused into liquid, when salt bath face rises to distance crucible top edge 150mm, stop salt adding; When cyanate radical is lower than required value 32%, adjustment salt 3 ~ 4kg should be added in nitrogenize salt bath, to improve cyanate radical content to 35%; After base salt all melts, run 4h at 600 ~ 650 DEG C of air furnaces, then come into operation; Nitriding temperature is 600 DEG C ~ 700 DEG C, and nitridation time is 30 ~ 240min.
2. deep layer QPQ new and high technology according to claim 1, it is characterized in that described clean-out system degreasing is treating that the workpiece of nitrogenize is placed in the container containing metal cleaner, to greasy dirt and the account thing scrub of the workpiece surface of nitrogenize be treated with cotton yarn piece by piece again, finally the cotton yarn being bonded at workpiece surface be removed clean.
3. deep layer QPQ new and high technology according to claim 1, is characterized in that described clear water rinsing to treat that the workpiece of nitrogenize is placed in rinse bath, then uses clear water rinsing 2 times.
4. deep layer QPQ new and high technology according to claim 1, it is characterized in that described preheating crucible is put into well formula air furnace to carry out preheating, preheating temperature is 300 DEG C ~ 400 DEG C, and warm up time is 20 ~ 30min.
5. deep layer QPQ new and high technology according to claim 1, is characterized in that described oxidation is first.Clean rustless crucible is hung in electric furnace, instrument constant temperature is at 220 DEG C, thermopair is near sidewall of crucible, then saline oxide is added in crucible, be added to 1/2 of crucible height, then be energized fusing, saline oxide is added gradually again after the salt that first time adds all melts, add suitable number at every turn, limit is melted, while add, until liquid level is elevated to distance crucible top edge 200mm, after salt bath face meets the requirements of height, be incubated 220 DEG C, moisture is volatilized in a large number, until liquid level no longer includes bubble produce complete calmness, then salt temperature heats up 10 ~ 20 DEG C again, circulation like this, until temperature is raised to 370 DEG C, oxidizing temperature is 350 DEG C ~ 370 DEG C, oxidization time is 15 ~ 20min.
6. deep layer QPQ new and high technology according to claim 1, it is characterized in that described cold wash desalt be workpiece from oxidized still out after precooling in atmosphere, until the saline solution of workpiece surface all starts condensation, then workpiece sent in cold water clean.
7. deep layer QPQ new and high technology according to claim 1, it is characterized in that described drying is that workpiece puts into hot water tank again, insulation after cold water cleaning, then cool in atmosphere, workpiece is dry rapidly.
8. deep layer QPQ new and high technology according to claim 1, is characterized in that described immersion oil is after workpiece drying, puts into total loss system oil and soaks 2 ~ 3min, then done by oil droplet.
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| CN104846327A (en) * | 2015-04-27 | 2015-08-19 | 郭伟 | Environment-friendly nanocrystallizing compound deep modifying method for metal materials |
| CN104762459B (en) * | 2015-04-27 | 2017-05-31 | 郭伟 | Metal material nanosizing strengthens method of modifying |
| CN105441864A (en) * | 2015-12-02 | 2016-03-30 | 成都锦汇科技有限公司 | QPQ nitrided salt and application process thereof |
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| CN105349942A (en) * | 2015-12-02 | 2016-02-24 | 成都锦汇科技有限公司 | QPQ (quench-polish-quench) salt bath treatment method |
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| CN107761045A (en) * | 2017-10-16 | 2018-03-06 | 天津天鑫旺达金属热处理有限公司 | A kind of auto parts and components metallic surface method of modifying |
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| CN111074198A (en) * | 2020-01-17 | 2020-04-28 | 怀集登月气门有限公司 | Valve surface strengthening treatment method |
| CN112342491B (en) * | 2020-08-26 | 2023-01-31 | 成都晟翔科技有限公司 | Golf club head surface composite structure and production method thereof |
| CN113215521A (en) * | 2021-03-31 | 2021-08-06 | 合肥赛飞斯金属科技有限公司 | QPQ (quench-Polish-quench) machining method of large-size gear ring |
| CN116200697A (en) * | 2022-12-30 | 2023-06-02 | 安徽兆鑫铝业科技有限公司 | Process method for carbonitriding curtain wall steel member thermal spraying aluminum alloy coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566396A (en) * | 2003-07-03 | 2005-01-19 | 上海华渊热处理有限公司 | Method for enhanced treatment of ductile iron surface |
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Effective date of registration: 20190109 Address after: Room 317, Building 3, 49 Haiheng Road, Situan Town, Fengxian District, Shanghai, 201412 Patentee after: Shanghai three new Mstar Technology Ltd. Address before: Room 403, 13 blocks, Tianpeng District, Situan Town, Fengxian District, Shanghai, 201412 Patentee before: Guo Wei |
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